The phenomenon that occurs when ice melts into water is called melting. This process occurs when ice absorbs heat, causing the molecules within the solid structure to vibrate more vigorously and transition to a liquid state. The melting point of ice is 0 degrees Celsius (32 degrees Fahrenheit) under standard atmospheric conditions. Melting plays a crucial role in various natural processes, including the water cycle, where it contributes to the flow of freshwater and influences ecosystems. Understanding melting is also important in addressing climate change and its impacts on polar regions.